1 Features
• Dual RF sampling 12-GSPS transmit DACs
• Triple RF sampling 3-GSPS receive ADCs
• Maximum RF signal bandwidth: 1200 MHz
• RF frequency range: 600 MHz - 12 GHz
• Digital step attenuators (DSA):
– TX: 40 dB range, 0.125-dB steps
– RX: 25 dB range, 0.5-dB steps
• Single or dual-band DUC or DDCs
• 16x NCOs per TX or RX
• Optional Internal PLL or VCO for DAC or ADC
clocks or external clock at DAC or ADC sample
rate
• SerDes data interface:
– JESD204B and JESD204C compatible
– 8 SerDes transceivers up to 29.5 Gbps
– Subclass 1 multi-device synchronization
• Package: 17-mm × 17-mm FCBGA, 0.8-mm pitch

2 Applications
• Radar
• Seeker front end
• Defense radio
• Tactical communications infrastructure
• Wireless communications test

3 Description
The AFE7955 is a high performance, wide bandwidth
multi-channel transceiver, integrating two RF sampling
transmitter chains and 3 RF sampling receiver chains.
With operation up to 12 GHz, this device enables
direct RF sampling in the L, S, C and X-band
frequency ranges without the need for additional
frequency conversions stages. This improvement in
density and flexibility enables high-channel-count,
multi-mission systems.
The TX signal paths support interpolation and digital
up conversion options that deliver up to 1200 MHz
of signal bandwidth per TX channel. The output
of the DUCs drives a 12-GSPS DAC (digital to
analog converter) with a mixed mode output option
to enhance 2nd Nyquist operation. The DAC output
includes a variable gain amplifier (TX DSA) with 40-
dB range and 1-dB analog and 0.125-dB digital steps.
Two receiver chains includes a 25-dB range DSA
(Digital Step Attenuator), followed by a 3-GSPS
ADC (analog-to-digital converter). The two receiver
channels have an analog peak power detector and
various digital power detectors to assist an external
or internal autonomous automatic gain controller, and
RF overload detectors for device reliability protection.
Flexible decimation options provide optimization of
signal bandwidth of up to 1200 MHz per RX channel.
An additional receiver channel has a single wideband
DDC supporting up to 1200 MHz bandwidth.